Preparation of foundation columns



Feb. 16, 1937. E. A. SMITH 2,071,046

PREPARATION OF FOUNDATION COLUMNS I Filed Oct. 5, 1935 1 5 Sheets-Sheet1 FIG". F I62.

I o I? E I llll ii' V w 5 lil M LU l VEN 30 W 4 M BY K M M ATTORNEY5Feb, 16, 1937. E. A. SMITH PREPARATION OF FOUNDATION COLUMNS 3Sheets-Sheet 2 Filed Oct. 5, 1953 a Z Q EV Q 4 M v-M ATTORNEYS Feb. 16,1937. 5M1; 2,071,046

PREPARATION OF FOUNDATION COLUMNS Filed Oct. 5, 1933 3 Sheets-Sheet 5FIGS. T

42 I O D f I 22 1 v 52 v26 1 I! I Hui-nu! 64 2o xe "1 llllu umw 52 A I!w 20 50 v 50 20 I \t I In w d gilt? l v '77?? I' 3 I INVENTO ATTORNEY5 vPatented Feb. 16, 1937 UNITED STATES .iRREPARiATIQN F LFOU'ND ATIONCOLUMNS Application noctojber 5,

5 Claims.

This invention pertains to [improvements :in method and apparatus forforming :concretecolumns as disclosed in Hart landschroeder Patent No.1,931,845.

In that disclosure .tthe hole vthe ,ground .is sunk bylmeans .ofan.annu'lar drill orcore cutter which forms the lowersection of the casingfor the mold, the upper casing section .l'oillow'ing the lower sectiondown "into the :hole zasitheldrilling proceeds.

The present invention contemplates "keeping the upper casing section outof the hole until the lower section compr'ising the drill has reachedthe desired depth, then lowering the upper section into watertightrelationship with the lower section so that the hole may be pumped outand inspected, after which the hole is filled with concrete to form thecolumn, the casing sections being either left in the hole to become partof the column, or withdrawn during or after the pouring of the concrete.

Further and other objects and advantages will be apparent from thespecification and claims, and from the accompanying drawings whichillustrate what is now considered the preferred embodiment of theinvention.

Fig. 1 shows the annular drill in position after drilling has beenfinished and before removal of the driving head and shaft.

Fig. 2 is the same as Fig. 1 after the driving head has been removed andthe upper section. of the casing has been lowered into position on thelower section, the conical guide ring being still attached to the bottomof the upper section.

Fig. 3 is an enlarged detail showing clamps for locking upper and lowercasing sections together, and the hoisting cables.

Fig. 4 is a View on line 4-4 of Fig. 3.

Fig. 5 illustrates a modification in which the casing is of reduceddiameter with reference to the cutter, the casing and cutter beingpartially withdrawn.

Fig. 6 is an enlarged sectional view of Fig. 5.

In the drawings (Fig. 1) I 0 designates a drill barrel of the typedisclosed in the above mentioned Hart et a1 application. I2 is the drivehead and I4 is the hollow drive shaft. The drive head has ears I6,adapted for automatic engagement or disengagement with lugs l8 welded orriveted to a steel ring integral with the drill barrel. The outer shellof the drill is extended upwardly above ring 20 to form a skirt 22 withits upper edge beveled as at 24 and having an internal circumferentialring 26 having its upper edge beveled as at 28 to form a conical seat.

1933, iSerial No. 56925-255 (Cl. .fi1.--..-5.7,)

Fig. 1 shows' the above mechan'ism-atthe completion of the drillingoperation, with the hole and drill ba-rrel full of mud, or mud-ladenfiuid (not shown) which prevents caving of the unlined =hole above thedrill, the --mud usually 'con- -s'is'ti-ng of earth loosened by thedrill and water fed to the drill. Under certain circumstances mud-ladenfluid is even fed to the drill :to act as a cutting agent. The :cuttingedge 'of the drill has penetrated into rock '38, and the drive head anddrive shaft are in oper-atiye posi- =tion.

-Fi'gfiZ shows the layout after head 12 and shaft 14 havebeenremoved'and the upper section of easing -32 has been lowered throughthe mud. The lower end of casing section 32 is provided with adetachable sectional conical guide ring 34 secured by bolts 36 to asteel ring 38 integral with the upper casing. The lower outer surface ofring 38 is conical as at 40 to form a continuation of the outer conicalsurface of guide ring 34. Set into the outer surface of ring 38, aboveits conical portion, is a ring 42 of rubber or other resilient packing.It will be observed that first ring 34, and then ring 38, engage theupper end of skirt 22 to align casing section 32 with the drill barrel,the conical portion 40 of ring 38 being seated on the conical seat 28 ofring 26 and the beveled edge 24 of the skirt being imbedded in packingring 42, thus providing a fluid tight joint between the drill barrel andcasing 32.

The mud-laden fluid is then pumped from the casing and drill barrel,after which a man is lowered into the casing to loosen bolts 36 so thatguide ring 34 may be removed. Then any solids which have settled intothe drill barrel are removed and the bottom of the hole (usually rock)is cleaned off for receiving the concrete. The hole may then be filledwith concrete to form the column, leaving casing and drill barrel inplace, or, if desired, the casing and barrel may be removed.

If removal of barrel and casing is desired, they are first clampedtogether as shown in Fig. 3. The upper surface of ring 38 is providedwith sockets or a groove 44 (Figs. 3 and 4) to accommodate lugs 46 ofupper clamp jaws 48 to prevent them from slipping out of place when thehoisting strain is applied. The lower clamp jaws 50 are heads of bolts52 and have inclined lips 54 adapted to engage the beveled lower edge ofring 20. As many clamping bolts as may be needed are applied as in Figs.3 and 4 and are clamped tight by means of nuts 56. Hoisting cables 58are attached to upwardly extending ears 60 inbarrel an adapter may beused, having a short full-diameter section 62 with a conical roof 64, towhich is bolted the bottom section 66 of the reduced casing, which needonly be of sufiicient diameter to permit passage of a man and possibly apump.

After the drill barrel and casing 66, are pumped out, the mud remainsundisturbed above roof 64 and around the outside of casing 66, therebypreventing caving of the walls of the hole.

When the reduced-diameter casing is used, the hoisting cables 68 may beattached to ribs III on roof 64, to permit withdrawal of the drill andeasing progressively as the concrete I2 is poured.

It is to be understood that the invention is not limited to the specificembodiment herein illustrated and described, but may be used in otherways without departure from its spirit as defined by the followingclaims.

I claim:

1. The method of forming a foundation column, which comprises sinking adrill barrel into the ground, lowering an annular easing into engagementwith said barrel, removing the contents of said barrel and casing, andfilling said barrel and casing with concrete to form the column.

2. The method of forming a foundation column, which comprises sinking adrill barrel into the ground, lowering an annular casing into engagementwith said barrel, removing the contents of said barrel and casing,locking said barrel to said casing,,filling said barrel and easing withconcrete, and withdrawing said barrel and easing together.

3. The method of forming a foundation column, which comprises sinking adrill barrel into the ground, lowering an annular casing into engagementwith said barrel, removing the contents of (said barrel and easing,locking said barrel to said casing, and filling said barrel and casingwith concrete to form the column.

4. The method of forming a foundation column, which comprises sinking adrill barrel into the ground, lowering an annular casing into engagementwith said barrel, removing the contents of said barrel and easing,locking said barrel to said casing, filling said barrel and casing withconcrete to form the column, and withdrawing said barrel and easing asthe filling progresses.

5. The method of forming a foundation column, which comprises sinking anannular drill into the ground, lowering an annular casing intoengagement with said drill, sealing the lower end of said casing to thedrill, removing the contents of said drill and casing, and filling saiddrill and casing with concrete to form the column.

EDWARD A. SMITH.

